Add Intel MCU target
Intel MCU System V ABI are incompartible with i386 System V ABI:
o Minimum instruction set is Intel Pentium ISA minus x87 instructions
o No x87 or vector registers
o First three args are passed in %eax, %edx and %ecx
o Full specification available here:
https://github.com/hjl-tools/x86-psABI/wiki/iamcu-psABI-0.7.pdf
newlib/
* configure.host: Add new ix86-*-elfiamcu target
newlib/libc/include/
* setjmp.h: Change _JBLEN for Intel MCU target
newlib/libc/machine/i386/
* memchr.S: (memchr) Target-specific size-optimized version
* memcmp.S: (memcmp) Likewise
* memcpy.S: (memcpy) Likewise
* memmove.S: (memmove) Likewise
* memset.S: (memset) Likewise
* setjmp.S: (setjmp) Likewise
* strchr.S: (strchr) Likewise
* strlen.S: (strlen) Likewise
newlib/libc/stdlib/
* srtold.c: (__flt_rounds) Disable for Intel MCU
This commit is contained in:
Igor Venevtsev
Corinna Vinschen
parent
44b72b43d6
commit
5d3ad3b123
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@ -696,6 +696,15 @@ case "${host}" in
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i[34567]86-*-netware*)
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newlib_cflags="${newlib_cflags} -DMISSING_SYSCALL_NAMES -DNO_EXEC -DABORT_PROVIDED -DCLOCK_PROVIDED -DMALLOC_PROVIDED -DHAVE_FCNTL"
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;;
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i[3-7]86-*-elfiamcu)
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newlib_cflags="${newlib_cflags} -Os -DPREFER_SIZE_OVER_SPEED -ffunction-sections -fomit-frame-pointer -DREENTRANT_SYSCALL_PROVIDED"
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if [ "${newlib_multithread}" = "no" ] ; then
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newlib_cflags="${newlib_cflags} -DMISSING_SYSCALL_NAMES"
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else
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syscall_dir=syscalls
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newlib_cflags="${newlib_cflags} -D__DYNAMIC_REENT__"
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fi
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;;
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iq2000*)
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syscall_dir=syscalls
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default_newlib_io_long_long="yes"
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@ -92,6 +92,9 @@ _BEGIN_STD_C
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# define _JBLEN (13 * 4)
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# elif defined(__unix__) || defined(__rtems__)
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# define _JBLEN 9
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# elif defined(__iamcu__)
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/* Intel MCU jmp_buf only covers callee-saved registers. */
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# define _JBLEN 6
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# else
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# include "setjmp-dj.h"
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# endif
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@ -14,13 +14,33 @@
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SOTYPE_FUNCTION(memchr)
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SYM (memchr):
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#ifdef __iamcu__
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pushl edi
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movl eax,edi
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movl edx,eax
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xorl edx,edx
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testl ecx,ecx
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jz L20
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repnz
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scasb
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setnz dl
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decl edi
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decl edx
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andl edi,edx
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L20:
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movl edx,eax
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popl edi
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#else
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pushl ebp
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movl esp,ebp
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pushl edi
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movzbl 12(ebp),eax
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movl 16(ebp),ecx
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movl 8(ebp),edi
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xorl edx,edx
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testl ecx,ecx
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jz L20
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@ -111,4 +131,5 @@ L20:
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leal -4(ebp),esp
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popl edi
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leave
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#endif
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ret
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@ -15,6 +15,33 @@
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SYM (memcmp):
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#ifdef __iamcu__
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pushl edi
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pushl esi
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movl eax,edi
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movl edx,esi
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cld
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/* check if length is zero in which case just return 0 */
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xorl eax,eax
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testl ecx,ecx
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jz L4
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/* compare any unaligned bytes or remainder bytes */
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repz
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cmpsb
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/* set output to be < 0 if less than, 0 if equal, or > 0 if greater than */
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xorl edx,edx
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movb -1(esi),dl
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movb -1(edi),al
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subl edx,eax
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L4:
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popl esi
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popl edi
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#else
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pushl ebp
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movl esp,ebp
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subl $16,esp
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@ -73,4 +100,5 @@ L4:
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popl edi
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popl ebx
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leave
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#endif
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ret
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@ -15,6 +15,17 @@
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SYM (memcpy):
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#ifdef __iamcu__
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pushl esi
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pushl edi
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movl eax,edi
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movl edx,esi
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rep movsb
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popl edi
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popl esi
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#else
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pushl ebp
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movl esp,ebp
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pushl esi
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@ -71,4 +82,5 @@ SYM (memcpy):
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popl edi
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popl esi
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leave
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#endif
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ret
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@ -15,6 +15,32 @@
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SYM (memmove):
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#ifdef __iamcu__
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pushl esi
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pushl edi
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movl eax,edi
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movl edx,esi
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cmp esi,edi
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ja .Lcopy_backward
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je .Lbwd_write_0bytes
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rep movsb
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popl edi
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popl esi
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ret
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.Lcopy_backward:
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lea -1(edi,ecx),edi
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lea -1(esi,ecx),esi
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std
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rep movsb
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cld
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.Lbwd_write_0bytes:
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popl edi
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popl esi
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#else
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pushl ebp
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movl esp,ebp
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pushl esi
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@ -143,4 +169,5 @@ SYM (memmove):
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popl edi
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popl esi
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leave
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#endif
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ret
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@ -15,6 +15,15 @@
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SYM (memset):
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#ifdef __iamcu__
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pushl edi
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movl eax,edi
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movzbl dl,eax
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mov edi,edx
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rep stosb
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mov edx,eax
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popl edi
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#else
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pushl ebp
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movl esp,ebp
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pushl edi
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@ -96,4 +105,5 @@ SYM (memset):
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leal -4(ebp),esp
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popl edi
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leave
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#endif
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ret
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@ -20,6 +20,10 @@
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** jmp_buf:
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** eax ebx ecx edx esi edi ebp esp eip
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** 0 4 8 12 16 20 24 28 32
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**
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** Intel MCU jmp_buf:
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** ebx esi edi ebp esp eip
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** 0 4 8 12 16 20
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*/
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#include "i386mach.h"
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@ -31,6 +35,23 @@
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SYM (setjmp):
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#ifdef __iamcu__
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/* Store EIP. */
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movl 0(esp),ecx
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movl ecx,20(eax)
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movl ebx,0 (eax)
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movl esi,4 (eax)
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movl edi,8 (eax)
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movl ebp,12(eax)
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/* Skip return address, which will be pushed onto stack in
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longjmp, and store SP. */
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leal 4(esp),ecx
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movl ecx,16(eax)
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xorl eax,eax
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#else
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pushl ebp
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movl esp,ebp
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@ -59,9 +80,28 @@ SYM (setjmp):
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popl edi
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movl $0,eax
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leave
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#endif
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ret
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SYM (longjmp):
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#ifdef __iamcu__
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/* Check retval. */
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testl edx,edx
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jne 0f
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incl edx
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0:
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/* Restore stack first. */
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movl 16(eax),esp
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/* Put return address on stack. */
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pushl 20(eax)
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movl 0(eax),ebx
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movl 4(eax),esi
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movl 8(eax),edi
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movl 12(eax),ebp
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movl edx,eax
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#else
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pushl ebp
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movl esp,ebp
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@ -87,5 +127,6 @@ SYM (longjmp):
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movl 16(edi),esi
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movl 20(edi),edi
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__STI
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#endif
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ret
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@ -15,6 +15,29 @@
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SYM (strchr):
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#ifdef __iamcu__
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xorl ecx,ecx
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movb dl,cl
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/* loop while (*s && *s++ != c) */
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leal -1(eax),eax
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L15:
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incl eax
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movb (eax),dl
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testb dl,dl
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je L14
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cmpb cl,dl
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jne L15
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L14:
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/* if (*s == c) return address otherwise return NULL */
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cmpb cl,(eax)
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je L19
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xorl eax,eax
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L19:
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ret
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#else
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pushl ebp
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movl esp,ebp
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pushl edi
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@ -170,3 +193,5 @@ L27:
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jmp L9
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#endif /* !__OPTIMIZE_SIZE__ */
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#endif /* __iamcu__ */
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@ -18,9 +18,13 @@ SYM (strlen):
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pushl ebp
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movl esp,ebp
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pushl edi
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#ifdef __iamcu__
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movl eax,edx
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#else
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movl 8(ebp),edx
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#endif
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#ifdef __OPTIMIZE_SIZE__
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#if defined __OPTIMIZE_SIZE__ || defined __iamcu__
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cld
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movl edx,edi
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movl $4294967295,ecx
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@ -35,7 +35,8 @@ POSSIBILITY OF SUCH DAMAGE.
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#ifdef _HAVE_LONG_DOUBLE
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#if defined (__x86_64__) || defined (__i386__)
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/* Intel MCU has no x87 floating point unit */
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#if (defined (__x86_64__) || defined (__i386__)) && !defined (__iamcu__)
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static const int map[] = {
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1, /* round to nearest */
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3, /* round to zero */
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Reference in New Issue